u/Hellthrower

Been learning Vayne lately (emerald flex), and was wondering what criteria you use for your builds. There's the standard kraken/bork -> guinso ->terminus+jaksho. And there's the hexplace -> reaver/triforce -> stormrazor + fiendhunter + IE. Is that correct? What makes you decide between onhit or critical/bruiser? How do you go about kraken vs bork? How do you go about reaver vs triforce? How do you decide on your items after the first 2? What about runes? Do you go alacrity or bloodline? And what about second tree? Resolve is probably better for onhit, do you go for sudden impact on crit build? Thanks